So i've been working on this one and have gone through the game twice using the guides. I have been to every single location this i know for a fact. So it would seem i have some kinda bug that is causing them not to register. Anyone else had this problem or know of a work around?

Went ahead and deleted my save files. Went back through and got the last 2 i was missing. Which is weird because i know i had them unlocked before since i had never seen the entire area then were in before.

Same thing happened to me 44/45 I went through 3 different guides and the youtube videos Im 100% sure I did not miss any. So the only possibility is a glitch or bug. It really sucks, a lot of time wasted and no achievement lol

Well...I went through every single location and I picked up every one of them according to the guide. There was one that never would register, so I went back after completing the game because I knew exactly where it was. I loaded up a save and went straight there...picked up the ammo, health that this particular Lambda was marking...and it still won't register. I have 44/45 now...I know exactly which one it is...I got there...and it still won't unlock!!! Please help!!!